<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- 嵌入样式 -->
    <style></style>
    <link rel="stylesheet" href="demo06.css">
</head>
<body>
    <!-- 内联样式的权重高于嵌入样式 -->
    <!-- <h1 style="color: chocolate;" id=>hello，world</h1> -->
    <h1  >hello，world</h1>
    <h2  >hello，world</h2>
</body>
</html>